The last Seleucid king ruled in name only.
Since he was a still a young child when his father Antiochus
X died (88 BCE), his mother Cleopatra Selene
acted as regent. Not only did she fail to gain recognition for his claim
to the throne of Egypt, she lost him control of most of Syria as well.
Deposed with her by Tigranes II of Armenia, Antiochus was briefly restored
as a client of Rome by Lucullus (68 BCE) but was soon challenged by his
second cousin Philip II. His assassination by the Arab ruler of Emesa, led
Pompey to abolish the Seleucid monarchy & make Syria
a Roman province.